[Buildroot] meaning of BR2_arm_dunno

[Sven Neumann]

Hi,

I wonder if anyone could explain to me the purpose of BR2_arm_dunno as
used in target/Config.in.arch. The reason I am asking is that we've run
into the problem of ending up with a misconfigured gcc (as reported
earlier on this list). I would like to find out how this can be avoided
in the future, but I seem to be unable to understand the mechanism that
selects the default values for BR2_GCC_TARGET_TUNE, BR2_GCC_TARGET_ARCH
and BR2_GCC_TARGET_ABI.


Sven